systemd unit for consul for zerotier auto DNS , dynamic Zerotier service-discovery

consul.service

[Unit]
Description=consul agent
Requires=network-online.target
After=network-online.target

[Service]
EnvironmentFile=-/etc/default/consul
Environment=GOMAXPROCS=2
Restart=on-failure
ExecStartPre=/usr/bin/bash -c "/usr/bin/systemctl set-environment ZEROTIER_IP=$(nmcli connection show zt0  |grep IP4.ADDRESS |awk '{print $
2}'|cut -f1 -d/)"
#ExecStart=/usr/local/sbin/consul agent $OPTIONS -config-dir=/etc/consul.d
ExecStart=/usr/local/bin/consul agent -server -bootstrap-expect=1 -bind $ZEROTIER_IP -data-dir=/tmp/consul -recursor 8.8.8.8 -ui -dns-port 
53 -datacenter bangna -domain softsq.com -config-dir=/etc/consul.d
ExecReload=/bin/kill -HUP $MAINPID
KillSignal=SIGINT

[Install]
WantedBy=multi-user.target